even christie realizes that being heavy isn't good for you. >> so far, up to 50 years old, i've been remarkably healthy. and, you know, my doctor continues to warn me that my luck is going to run out relatively soon. so it's something i'm very conscious of. >> reporter: if christie wants to be president and wants to lose weight before he gets to the white house, doctors tell cnn, he could do it. they say the diet plan might likely include drugs, liquid diets, or surgery, and just like the road to the white house, it wouldn't be easy. i mentioned a study that said that being morbidly obese takes eight to ten years off your life. well, the average life expectancy for a man in this country is about 76. so statistically speaking, governor christie is so young, that he would -- again, statistically speaking, survive a term in office and even two terms in office. wolf? >> elizabeth cohen, thanks very, very much. >>> happening now, a cop killer at large. police across california are hunting down one of their own. there's now a cnn, a cnn connection to this story. >>> a region terrified by a